classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: ramwing7 on February 19, 2026, 05:47:49 PM

Title: BSA b31 Dynamo
Post by: ramwing7 on February 19, 2026, 05:47:49 PM

I recently came to own a 1949 BSA B31 without a hint of a wiring harness.  The magneto throws a hot spark, so I'd like to see if it will start up.
Question is will I damage the dynamo by running it under no load?
Thanks.

Title: Re: BSA b31 Dynamo
Post by: R on February 19, 2026, 09:30:19 PM

No.
As long as there are no wires coming out of the genny,
all those little electrons cannot be led astray

The genny is easily removable also, if this a long term setup.
Put a cover there to keep debris out ...

Title: Re: BSA b31 Dynamo
Post by: ramwing7 on February 20, 2026, 04:07:39 PM

Many thanks.   ;D